Method and device for batch separation of mixed bed ion exchange resin from sodium chloride solution for laboratory

Abstract

The invention discloses a method and a device for batch separation of mixed bed ion exchange resin from a sodium chloride solution for a laboratory, and belongs to the technical field of laboratory ion exchange resin physical and chemical property detection. The system disclosed by the invention comprises an air supply system, a saturated sodium chloride solution supply system, a demineralized water supply system, an ion exchange resin separation column, a measurement system and a control system, the air supply system, the saturated sodium chloride solution supply system and the demineralized water supply system are respectively connected with a bottom inlet of the ion exchange resin separation column through pipelines; the measuring system is arranged in the ion exchange resin separation column and is electrically connected with the control system; the control system is arranged outside the ion exchange resin separation column; the saturated sodium chloride solution supply system and the demineralized water supply system are electrically connected with the control system respectively. The system solves the technical problems that anion exchange resin and cation exchange resin are not thoroughly separated, time and labor are wasted, the efficiency is low, and the method is poor in applicability.

Description

Technical Field

[0001] This invention belongs to the field of laboratory ion exchange resin physicochemical property testing technology, specifically relating to a method and apparatus for batch separation of mixed bed ion exchange resins using sodium chloride solution in the laboratory. Background Technology

[0002] Ion exchange resins possess excellent ion exchange capabilities and play a crucial role in water treatment. Anion and cation exchange resins, alone or in different proportions, can form ion exchange cation bed systems, ion exchange resin anion bed systems, and ion exchange resin mixed bed systems. During operation, ion exchange mixed bed systems can simultaneously replace calcium in the water. 2+ Na + Cations and SO4 2- Cl - Anion exchange resins can achieve deep desalination of water and are widely used in power, electronics, pharmaceutical, and chemical industries. During the operation of a mixed-bed ion exchange resin system, close monitoring of the physicochemical properties of the ion exchange resins, such as exchange capacity, sphericity, and crushing strength, is necessary to determine the operating conditions of the mixed bed and the resin replacement cycle. When testing the crushing strength, exchange capacity, and particle size of ion exchange resins in the laboratory, it is usually necessary to test the anion and cation exchange resins separately in the mixed bed system. However, because the anion and cation exchange resins are uniformly mixed in the mixed bed system, current laboratory methods mainly separate them by soaking in saturated sodium chloride solution or demineralized water. This method cannot achieve complete separation of the anion and cation exchange resins and is time-consuming, labor-intensive, and consumes large amounts of saturated sodium chloride solution and demineralized water. Furthermore, this method cannot flexibly adjust the concentration of the separation solution according to the different densities of the mixed bed resins, resulting in poor universality. Therefore, a simple and efficient method for separating ion exchange resins in mixed beds is needed. Summary of the Invention

[0003] The purpose of this invention is to provide a method and apparatus for batch separation of mixed-bed ion exchange resins using sodium chloride solution in the laboratory, which solves the technical problems of incomplete separation, labor-intensive and time-consuming processes, and poor applicability caused by high material consumption in existing separation methods.

[0004] To achieve the above objectives, the present invention employs the following technical solution: This invention discloses a system for batch separation of mixed-bed ion exchange resins using laboratory sodium chloride solution, comprising: The system includes an air supply system, a saturated sodium chloride solution supply system, a demineralized water supply system, an ion exchange resin separation column, a measurement system, and a control system. The air supply system, saturated sodium chloride solution supply system, and demineralized water supply system are connected to the bottom inlet of the ion exchange resin separation column via pipelines. The measurement system is located inside the ion exchange resin separation column and is electrically connected to the control system. The control system is located outside the ion exchange resin separation column. The saturated sodium chloride solution supply system and the demineralized water supply system are electrically connected to the control system.

[0005] Furthermore, the measurement system includes a density sensor and a liquid level sensor disposed inside the ion exchange resin separation column.

[0006] Furthermore, both the density sensor and the level sensor are electrically connected to the control system via a data transmitter.

[0007] Furthermore, valves are installed on the pipelines connecting the air supply system, the saturated sodium chloride solution supply system, and the demineralized water supply system to the bottom of the ion exchange resin separation column.

[0008] Furthermore, the saturated sodium chloride solution supply system includes a saturated sodium chloride solution storage tank and a first peristaltic pump; the saturated sodium chloride solution storage tank, the first peristaltic pump, and the valve are sequentially connected to the bottom of the ion exchange resin separation column; The first peristaltic pump is electrically connected to the control system.

[0009] Furthermore, the demineralized water supply system includes a demineralized water storage tank and a second peristaltic pump; the demineralized water storage tank, the second peristaltic pump, and the valve are sequentially connected to the bottom of the ion exchange resin separation column; The second peristaltic pump is electrically connected to the control system.

[0010] Furthermore, there are multiple ion exchange resin separation columns, which are connected in parallel.

[0011] This invention also discloses a method for separation using the above-mentioned laboratory sodium chloride solution for batch separation of mixed-bed ion exchange resins, comprising the following steps: Mixed bed resin is added to the ion exchange resin separation column, and then compressed air is introduced from the bottom of the ion exchange resin separation column through the air supply system to disperse the mixed bed resin. Subsequently, saturated sodium chloride solution is introduced from the bottom of the ion exchange resin separation column through the saturated sodium chloride solution supply system. When the liquid level of the saturated sodium chloride solution reaches the maximum value, the mixed bed resin is immersed in the saturated sodium chloride solution. At this time, the measurement system transmits the liquid level data of the saturated sodium chloride solution to the control system, and the control system controls the shutdown of the sodium chloride solution supply system. Subsequently, the saturated sodium chloride solution supply system is continued to be turned on, and saturated sodium chloride solution is introduced from the bottom of the ion exchange resin separation column until separation of the anion exchange resin and cation exchange resin is observed. Then, the introduction of saturated sodium chloride solution is stopped. If it is observed that the anion exchange resin and cation exchange resin are not completely separated, the saturated sodium chloride solution supply system is turned off, and the demineralized water supply system is turned on to introduce demineralized water from the bottom of the ion exchange resin separation column. The density data inside the ion exchange resin separation column is measured using a measurement system, and the density data is transmitted to the control system. The control system then controls the opening and closing of the saturated sodium chloride solution supply system and the demineralized water supply system until the density inside the ion exchange resin separation column reaches the optimal separation density, thus achieving the separation of the anion exchange resin and cation exchange resin.

[0012] Furthermore, the measurement system includes a density sensor and a level sensor disposed inside the ion exchange resin separation column; both the density sensor and the level sensor are electrically connected to the control system via a data transmitter; the saturated sodium chloride solution supply system includes a saturated sodium chloride solution storage tank and a first peristaltic pump; the demineralized water supply system includes a demineralized water storage tank and a second peristaltic pump; the separation method specifically includes the following steps: Mixed bed resin is added to the ion exchange resin separation column, and then compressed air is introduced from the bottom of the ion exchange resin separation column through the air supply system to disperse the mixed bed resin. Subsequently, saturated sodium chloride solution is introduced from the bottom of the ion exchange resin separation column through the saturated sodium chloride solution supply system. When the liquid level of the saturated sodium chloride solution reaches the highest value, the mixed bed resin is immersed in the saturated sodium chloride solution. At this time, the liquid level sensor transmits the liquid level data of the saturated sodium chloride solution to the control system through the data transmitter, and the control system controls the shutdown of the first peristaltic pump. The first peristaltic pump is then turned on, and saturated sodium chloride solution is introduced from the bottom of the ion exchange resin separation column until separation of the anion exchange resin and cation exchange resin is observed. Then, the introduction of saturated sodium chloride solution is stopped. If complete separation of the anion exchange resin and cation exchange resin is observed, the first peristaltic pump is turned off, and the second peristaltic pump is turned on to introduce demineralized water from the bottom of the ion exchange resin separation column. A level sensor is used to measure the density data within the ion exchange resin separation column, and the density data is transmitted to the control system via a data transmitter. The control system then controls the opening and closing of the first and second peristaltic pumps until the density within the ion exchange resin separation column reaches the optimal separation density, ultimately achieving the separation of the anion exchange resin and cation exchange resin.

[0013] Furthermore, the compressed air flow rate is 5~10L / min; The flow rate of the saturated sodium chloride solution is 10~15 mL / min.

[0014] The mixed bed resin is immersed in a saturated sodium chloride solution for 10-15 minutes; The optimal separation density is 1.10~1.16 g / cm³. 3 .

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention discloses a system for batch separation of mixed-bed ion exchange resins using laboratory sodium chloride solution. By setting up an air supply system, a saturated sodium chloride solution supply system, a demineralized water supply system, an ion exchange resin separation column, a measurement system, and a control system, these systems work synergistically. Compressed air is supplied to scrub and completely disperse the mixed-bed ion exchange resins, preparing them for subsequent separation. The saturated sodium chloride solution supply system and the demineralized water supply system, jointly controlled by the measurement and control systems, can flexibly adjust the supply of saturated sodium chloride solution and demineralized water according to the specific separation conditions. The addition of demineralized water alters the density of the solution within the ion exchange resin separation column to accommodate different types of mixed-bed ion exchange resins. This system solves the technical problems of incomplete separation of anion and cation exchange resins, time-consuming and labor-intensive processes, low efficiency, and poor applicability.

[0016] Furthermore, the ion exchange resin separation column in this invention can be configured as N batch processing devices connected in parallel, which can simultaneously separate multiple mixed bed ion exchange resins, significantly improving work efficiency.

[0017] The present invention also discloses a method for separation using the above-mentioned system. This method utilizes the characteristic that the densities of anion exchange resin and cation exchange resin are between those of a saturated sodium chloride solution. First, the mixed-bed ion exchange resin is uniformly dispersed by nitrogen wiping. Second, it is backwashed with a saturated sodium chloride solution. The density of the sodium chloride solution in the separation column is precisely controlled by adding demineralized water, thereby achieving efficient, accurate, and rapid separation of the mixed-bed ion exchange resin. The efficient separation of anion exchange resin and cation exchange resin is achieved by air wiping, backwashing with a saturated sodium chloride solution, and soaking treatment, and by precisely changing the liquid density in the separation column by adding demineralized water. Attached Figure Description

[0018] Figure 1 This is an overall structural diagram of the system for batch separation of mixed-bed ion exchange resins using sodium chloride solution in the laboratory according to the present invention; Figure 2 This is a schematic diagram of the interior of an ion exchange resin separation column; Figure 3 This is a process flow diagram of the method for batch separation of mixed bed ion exchange resins using sodium chloride solution in the laboratory according to the present invention. Wherein: 1-Saturated sodium chloride solution storage tank; 2-Demineralized water storage tank; 3-Ion exchange resin separation column; 4-Density sensor; 5-Level sensor; 6-Data transmitter; 7-Control system; 8-First peristaltic pump; 9-Second peristaltic pump. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0020] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0021] The present invention will now be described in further detail with reference to the accompanying drawings: See Figure 1 and Figure 2As shown, this invention discloses a system for batch separation of mixed-bed ion exchange resins using sodium chloride solution in the laboratory. The system includes an air supply system, a saturated sodium chloride solution supply system, a demineralized water supply system, an ion exchange resin separation column 3, a measurement system, and a control system 7. The saturated sodium chloride solution supply system includes a saturated sodium chloride solution storage tank 1 and a first peristaltic pump 8. The saturated sodium chloride solution storage tank 1, the first peristaltic pump 8, and a valve are sequentially connected to the bottom of the ion exchange resin separation column 3. The first peristaltic pump 8 is electrically connected to the control system 7. The demineralized water supply system includes a demineralized water storage tank 2 and a second peristaltic pump 9. The demineralized water storage tank 2, the second peristaltic pump 9, and the valve are sequentially connected to the bottom of the ion exchange resin separation column 3. The second peristaltic pump 9 is electrically connected to the control system 7. The control system 7 is located outside the ion exchange resin separation column 3. The measurement system includes a density sensor 4 and a level sensor 5 located inside the ion exchange resin separation column 3. Both the density sensor 4 and the level sensor 5 are electrically connected to the control system 7 via a data transmitter 6.

[0022] Preferably, valves are installed on the pipelines connecting the air supply system, the saturated sodium chloride solution supply system, and the demineralized water supply system to the bottom of the ion exchange resin separation column 3.

[0023] Preferably, the number of ion exchange resin separation columns 3 is multiple (2, 3, 4...N), and the multiple ion exchange resin separation columns 3 are arranged in parallel.

[0024] This invention also discloses a method for separation using the above system, which achieves efficient separation of anion exchange resins and cation exchange resins by air rinsing, backwashing with saturated sodium chloride solution, and soaking treatment, and by adding demineralized water to precisely change the liquid density inside the separation column. Figure 3 As shown, the specific steps are as follows: Step 1: Prepare a certain amount of demineralized water and continuously add analytical grade sodium chloride to it until sodium chloride precipitate is observed to form at the bottom, thus obtaining a saturated sodium chloride solution. Step 2: Add the above saturated sodium chloride solution to saturated sodium chloride solution storage tank 1; Step 3: Prepare a certain amount of demineralized water and add it to the demineralized water storage tank 2; Step 4: Add a certain amount (approximately 60g) of mixed bed resin to ion exchange resin separation column 3; Step 5: Density sensor 4 and liquid level sensor 5 are installed in ion exchange resin separation column 3 to monitor the liquid level and density of the solution at any time. At the same time, the liquid level and density data are fed back to the control system 7 in real time through data transmitter 6. Step 6: Introduce compressed air at a certain flow rate (5L / min) through the air supply system from the bottom of the ion exchange resin separation column 3 to break up the clumps of resin and wipe the surface of the ion exchange resin until the mixed bed ion exchange resin is completely dispersed. Then close the air inlet valve at the bottom of the ion exchange resin separation column 3. Step 7: The saturated sodium chloride solution in the saturated sodium chloride solution storage tank 1 is pumped into the ion exchange resin separation column 3 through the first peristaltic pump 8 at a certain flow rate (10 mL / min); Step 8: Saturated sodium chloride solution is continuously introduced into the ion exchange resin separation column 3 until it reaches its highest liquid level; at this time, the liquid level sensor 5 in the ion exchange resin separation column 3 transmits the signal to the control system 7 through the data transmitter 6, and the first peristaltic pump 8 stops working at the same time; allow the mixed bed ion exchange resin to be fully soaked in the saturated sodium chloride solution for 10 minutes. Step 9: After 10 minutes, the first peristaltic pump 8 continues to pump the saturated sodium chloride solution in the saturated sodium chloride solution storage tank 1 into the ion exchange resin separation column 3. Excess saturated sodium chloride solution overflows from the ion exchange resin separation column 3 until the separation of the anion exchange resin and the cation exchange resin is observed, at which point the addition of saturated sodium chloride solution is stopped. Step 10: If the separation effect of anion exchange resin and cation exchange resin is not observed to be good, the density of the liquid in the ion exchange resin separation column 3 can be changed by pumping demineralized water from the bottom of the ion exchange resin separation column 3 through the second peristaltic pump 9. The density sensor 4 detects the density of sodium chloride solution in the separation column in real time and transmits the solution density value to the control system 7 through the data transmitter 6. Furthermore, the saturated sodium chloride solution or demineralized water is added by controlling the start and stop of the first peristaltic pump 8 and the second peristaltic pump 9 to achieve the optimal separation density. Step 11: Remove the cation exchange resin from the top of the ion exchange resin separation column 3 and remove the anion exchange resin from the bottom of the ion exchange resin separation column 3.

[0025] The separation method of this invention allows for the complete separation of anion exchange resins and cation exchange resins. Furthermore, this method is simple to operate, low in cost, and suitable for rapid laboratory procedures.

[0026] The mixed bed system ion exchange resin separation device can simultaneously separate different types of mixed bed ion exchange resins by being connected in parallel.

[0027] Example 1 A company took resin samples from a mixed-bed ion exchange system to evaluate its physicochemical properties. The mixed-bed ion exchange resins included cation exchange resin (model: MonoPlus S 108 H) and anion exchange resin (model: MonoPlus M 800). After receiving the sample, the laboratory found that the anion exchange resin and the cationic resin were mixed evenly, but there was a small amount of clumping. Step 1: Add approximately 60g of mixed-bed ion exchange resin to ion exchange resin separation column 3.

[0028] Step 2: Introduce compressed air at a flow rate of 5 L / min from the bottom of the ion exchange resin separation column 3 to scrub and break up the clumps of mixed bed ion exchange resin, so that it is completely dispersed, and then stop introducing compressed air.

[0029] Step 3: The saturated sodium chloride solution in the saturated sodium chloride solution storage tank 1 is pumped into the ion exchange resin separation column 3 from the bottom using the first peristaltic pump 8 at a flow rate of 10 mL / min until the maximum liquid level is reached; at this time, the liquid level sensor 5 inside the ion exchange resin separation column 3 transmits the signal to the control system 7 through the data transmitter 6, and the first peristaltic pump 8 stops working at the same time; allow the mixed bed ion exchange resin to be fully soaked in the saturated sodium chloride solution for 10 minutes; Step 4: After 10 minutes, the first peristaltic pump 8 continues to pump the saturated sodium chloride solution from the saturated sodium chloride solution storage tank 1 into the ion exchange resin separation column 3. Excess saturated sodium chloride solution overflows from the ion exchange resin separation column 3 until the separation of the anion exchange resin and the cation exchange resin is observed, at which point the addition of saturated sodium chloride solution is stopped. Step 5: Remove the anion exchange resin from the top of ion exchange resin separation column 3, and remove the cation exchange resin from the bottom of ion exchange resin separation column 3; the density of the saturated sodium chloride solution at 25℃ is approximately 1.20 g / cm³. 3 The density of the anion exchange resin is less than 1.20 g / cm³. 3 The density of the cation exchange resin is greater than 1.20 g / cm³. 3 Therefore, the anion exchange resin is located at the top of the ion exchange resin separation column 3, the sodium chloride solution is located in the middle, and the cation exchange resin is located at the bottom. Note: The true density of MonoPlus S 108 H cation exchange resin after separation was measured to be 1.233 g / cm³. 3 The wet true density of MonoPlus M 800 anion exchange resin is 1.074 g / cm³. 3 .

[0030] Example 2: In practical work, it has been found that the density of some cation exchange resins is less than the density of a saturated sodium chloride solution at 25°C; this embodiment targets cation exchange resins with a density less than 1.20 g / cm³. 3 The situation.

[0031] A unit took resin from a mixed-bed ion exchange system to evaluate its physicochemical properties; the mixed-bed ion exchange resin includes a strong acid cation exchange resin (model: 001×7MB) and a strong base anion exchange resin (model: 201X7MB).

[0032] Step 1: Add approximately 60g of mixed-bed ion exchange resin into ion exchange separation column 3.

[0033] Step 2: Introduce compressed air at a flow rate of 5L / min from the bottom of ion exchange separation column 3 to scrub and break up the clumps of mixed bed ion exchange resin, so that it is completely dispersed, and then stop introducing compressed air. Step 3: The saturated sodium chloride solution in the saturated sodium chloride solution storage tank 1 is pumped into the ion exchange resin separation column 3 from the bottom through the first peristaltic pump 8 at a flow rate of 10 mL / min until the maximum liquid level is reached; at this time, the liquid level sensor 5 in the ion exchange resin separation column 3 transmits the signal to the control system 7 through the data transmitter 6, and the first peristaltic pump 8 stops working at the same time; allow the mixed bed ion exchange resin to be fully soaked in the saturated sodium chloride solution for 10 minutes.

[0034] Step 4: After 10 minutes, the first peristaltic pump 8 continues to pump the saturated sodium chloride solution from the saturated sodium chloride solution storage tank 1 into the ion exchange resin separation column 3. Excess saturated sodium chloride solution overflows from the ion exchange resin separation column 3. After continuously adding saturated sodium chloride solution, it was found that the anion exchange resin was concentrated in the upper part of the ion exchange resin separation column 3, but there was no obvious stratification between the cation exchange resin and the saturated sodium chloride solution. At this time, the control system 7 reads the density of the sodium chloride solution in the ion exchange resin separation column 3 as 1.20 g / cm³. 3 ; Step 5: Adjust the density setting to 1.19 g / cm³ 3 The second peristaltic pump 9 pumps demineralized water into the bottom of the ion exchange resin separation column 3 until the density of the sodium chloride solution reaches the set value; at this time, it is observed that there is no obvious stratification between the cation exchange resin and the saturated sodium chloride solution. Step 6: Adjust the density setting to 1.18 g / cm³ 3 The second peristaltic pump 9 pumps demineralized water into the bottom of the ion exchange resin separation column 3 until the density of the sodium chloride solution reaches the set value; at this time, it is observed that there is no obvious stratification between the cation exchange resin and the saturated sodium chloride solution. Step 7: Adjust the density setting to 1.17 g / cm³ 3 The second peristaltic pump 9 pumps demineralized water into the bottom of the ion exchange resin separation column 3 until the density of the sodium chloride solution reaches the set value; at this time, it is observed that the cation exchange resin and the saturated sodium chloride solution begin to separate into layers. Step 8: Adjust the density setting to 1.16 g / cm³3 The second peristaltic pump 9 pumps demineralized water into the bottom of the ion exchange resin separation column 3 until the density of the sodium chloride solution reaches the set value; at this time, it is observed that the cation exchange resin and the saturated sodium chloride solution are clearly separated into layers; Step 9: Remove the anion exchange resin from the top of ion exchange resin separation column 3, and remove the cation exchange resin from the bottom of ion exchange resin separation column 3; at this point, the density of the sodium chloride solution is approximately 1.16 g / cm³. 3 The density of the anion exchange resin is less than 1.16 g / cm³. 3 The density of the cation exchange resin is greater than 1.16 g / cm³. 3 Therefore, the anion exchange resin is located at the top of the ion exchange resin separation column 3, the sodium chloride solution is located in the middle, and the cation exchange resin is located at the bottom.

[0035] Note: The wet true density of the 001×7MB strong acid cation exchange resin after separation was measured to be 1.171 g / cm³. 3 The wet true density of 201×7MB strong basic anion exchange resin is 1.076 g / cm³. 3 .

[0036] It is worth noting that the laboratory cannot know the wet true density of the mixed-bed ion exchange resin when it receives it. Therefore, it is essential to accurately separate the mixed-bed ion exchange resin by adding demineralized water to change the density of the sodium chloride solution in the ion exchange resin separation column 3.

[0037] Example 3: In routine testing and analysis, it is often necessary to process multiple mixed-bed ion exchange resin samples simultaneously. The ion exchange resin separation column C in this invention can be connected in parallel in numbers of 2, 3, 4...N, enabling the simultaneous separation of multiple mixed-bed ion exchange resins.

[0038] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A system for batch separation of ion exchange resins of a mixed bed by a sodium chloride solution in a laboratory, characterized by, The application relates to a mixed bed resin separation column system, which comprises an air supply system, a saturated sodium chloride solution supply system, a desalted water supply system, an ion exchange resin separation column (3), a measuring system and a control system (7); the air supply system, the saturated sodium chloride solution supply system and the desalted water supply system are connected with the bottom inlet of the ion exchange resin separation column (3) through pipelines respectively; the measuring system is arranged in the ion exchange resin separation column (3) and is electrically connected with the control system (7); and the control system (7) is arranged outside the ion exchange resin separation column (3). The saturated sodium chloride solution supply system and the desalted water supply system are electrically connected with the control system (7) respectively. The measuring system comprises a density sensor (4) and a liquid level sensor (5) arranged in the ion exchange resin separation column (3).

2. A system for batch separation of ion exchange resins of a mixed bed for laboratory sodium chloride solution according to claim 3, characterized in that, The density sensor (4) and the liquid level sensor (5) are electrically connected through a data transmitter (6) and the control system (7).

3. A system for batch separation of ion exchange resins of a mixed bed for laboratory sodium chloride solution according to claim 2, characterized in that, Valves are arranged on the pipelines, through which the air supply system, the saturated sodium chloride solution supply system and the desalted water supply system are connected with the bottom of the ion exchange resin separation column (3).

4. The system for batch separation of ion exchange resins of a mixed bed of laboratory sodium chloride solution of claim 1, wherein, The saturated sodium chloride solution supply system comprises a saturated sodium chloride solution storage tank (1) and a first peristaltic pump (8); the saturated sodium chloride solution storage tank (1), the first peristaltic pump (8) and the valve are sequentially connected with the bottom of the ion exchange resin separation column (3).

5. A system for batch separation of ion exchange resins of a mixed bed for laboratory sodium chloride solution according to claim 4, characterized in that, The first peristaltic pump (8) is electrically connected with the control system (7). The desalted water supply system comprises a desalted water storage tank (2) and a second peristaltic pump (9); the desalted water storage tank (2), the second peristaltic pump (9) and the valve are sequentially connected with the bottom of the ion exchange resin separation column (3).

6. A system for batch separation of ion exchange resins of a mixed bed for laboratory sodium chloride solution according to claim 5, characterized in that, The second peristaltic pump (9) is electrically connected with the control system (7). The number of the ion exchange resin separation columns (3) is multiple, and the multiple ion exchange resin separation columns (3) are arranged in parallel.

7. A system for batch separation of ion exchange resins of a mixed bed for laboratory sodium chloride solution according to claim 5, characterized in that, The application further discloses a mixed bed resin separation column system operation method, which comprises the following steps:

8. A method of separation using the system for batch separation of ion exchange resins of a mixed bed according to any one of claims 1 to 7, characterized in that, The mixed bed resin is added into the ion exchange resin separation column (3), and then compressed air is introduced from the bottom of the ion exchange resin separation column (3) through the air supply system to disperse the mixed bed resin; Then saturated sodium chloride solution is introduced from the bottom of the ion exchange resin separation column (3) through the saturated sodium chloride solution supply system, and when the liquid level of the saturated sodium chloride solution reaches the maximum value, the mixed bed resin is soaked in the saturated sodium chloride solution; at this time, the measuring system transmits the liquid level data of the saturated sodium chloride solution to the control system (7), and the control system (7) controls to close the sodium chloride solution supply system; ​ Subsequently, continue to open the saturated sodium chloride solution supply system, from the bottom of the ion exchange resin separation column (3) into the saturated sodium chloride solution, until the observation of the observation of the anion exchange resin and cation exchange resin separation, stop into the saturated sodium chloride solution; If the observation of the anion exchange resin and cation exchange resin has not been completely separated, then close the saturated sodium chloride solution supply system, open the desalted water supply system from the bottom of the ion exchange resin separation column (3) into the desalted water, using the measuring system to measure the density data in the ion exchange resin separation column (3), and the density data is transmitted to the control system (7), then the control system (7) controls the opening and closing of the saturated sodium chloride solution supply system and the desalted water supply system, until the density in the ion exchange resin separation column (3) reaches the optimal separation density, finally realize the separation of anion exchange resin and cation exchange resin.

9. The method of separating a laboratory sodium chloride solution batch separation mixed bed ion exchange resin system according to claim 8, wherein, The measuring system comprises a density sensor (4) and a liquid level sensor (5) arranged inside the ion exchange resin separation column (3); the density sensor (4) and the liquid level sensor (5) are electrically connected through a data transmitter (6) and a control system (7); the saturated sodium chloride solution supply system comprises a saturated sodium chloride solution storage tank (1) and a first peristaltic pump (8); the desalted water supply system comprises a desalted water storage tank (2) and a second peristaltic pump (9); the separation method specifically comprises the following steps: The mixed bed resin is added to the ion exchange resin separation column (3), and then compressed air is introduced from the bottom of the ion exchange resin separation column (3) through the air supply system to disperse the mixed bed resin; Then the saturated sodium chloride solution is introduced from the bottom of the ion exchange resin separation column (3) through the saturated sodium chloride solution supply system, and when the liquid level of the saturated sodium chloride solution reaches the maximum value, the mixed bed resin is soaked in the saturated sodium chloride solution, at this time the liquid level sensor (5) transmits the liquid level data of the saturated sodium chloride solution to the control system (7) through the data transmitter (6), and the control system (7) controls the first peristaltic pump (8) to be closed; Then continue to open the first peristaltic pump (8) to introduce the saturated sodium chloride solution from the bottom of the ion exchange resin separation column (3), until the observation of the observation of the anion exchange resin and cation exchange resin separation, stop into the saturated sodium chloride solution; If the observation of the anion exchange resin and cation exchange resin has not been completely separated, then close the first peristaltic pump (8), open the second peristaltic pump (9) from the bottom of the ion exchange resin separation column (3) into the desalted water, using the liquid level sensor (5) to measure the density data in the ion exchange resin separation column (3), and the density data is transmitted to the control system (7) through the data transmitter (6), then the control system (7) controls the opening and closing of the first peristaltic pump (8) and the second peristaltic pump (9), until the density in the ion exchange resin separation column (3) reaches the optimal separation density, finally realize the separation of anion exchange resin and cation exchange resin.

10. The method of separating a laboratory sodium chloride solution batch separation mixed bed ion exchange resin system according to claim 9, wherein, The flow rate of the compressed air introduced is 5-10 L / min; The flow rate of the saturated sodium chloride solution introduced is 10-15 mL / min. The time for which the mixed bed resin is soaked in the saturated sodium chloride solution is 10-15 min; The time for which the mixed bed resin is soaked in the saturated sodium chloride solution is 10-15 min; The optimal separation density is 1.10~1.16g / cm 3 .

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